EP1921020A1 - Pressure compensation element for a casing - Google Patents

Pressure compensation element for a casing Download PDF

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Publication number
EP1921020A1
EP1921020A1 EP07117632A EP07117632A EP1921020A1 EP 1921020 A1 EP1921020 A1 EP 1921020A1 EP 07117632 A EP07117632 A EP 07117632A EP 07117632 A EP07117632 A EP 07117632A EP 1921020 A1 EP1921020 A1 EP 1921020A1
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EP
European Patent Office
Prior art keywords
sealing
housing
sealing element
pressure compensation
compensation element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07117632A
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German (de)
French (fr)
Inventor
Alexander Geissler
Udo Hennel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1921020A1 publication Critical patent/EP1921020A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/03—Gas-tight or water-tight arrangements with provision for venting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0213—Venting apertures; Constructional details thereof
    • H05K5/0216—Venting plugs comprising semi-permeable membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means

Definitions

  • the invention relates to a pressure compensation element for a housing according to the preamble of claim 1.
  • Sealed housings are well known in the art. In particular, they are used in applications for electronic controls in vehicles, for example, for control devices. In order to meet the very wide thermal and barometric application of the applications, and due to the fact that due to heating and cooling of the introduced electronic circuits there are under- and overpressures in the housing, which burden the seals and joints, require such sealed housing a pressure equalization.
  • the pressure equalization is ensured in the prior art by semipermeable membranes, which are usually glued directly to the housing, welded or molded with plastic. In order to use the semi-permeable membranes in conjunction with such a housing, they generally require mechanical protection in order to avoid damage and thus leakage.
  • the object of the invention is to provide a pressure compensation element for a sealed housing, which avoids the disadvantages mentioned, and ensures safe pressure equalization with simultaneous tightness in the area of high mechanical and fluidic load.
  • a pressure compensation element for a housing in particular for a housing which accommodates an electronic circuit, is proposed, with a semipermeable membrane held by a holding device and at least one sealing element for sealing against the housing.
  • the holding device is formed by the sealing element.
  • Holding device and sealing element are therefore, at least substantially, one and the same object.
  • the semipermeable membrane is consequently not used with different elements, namely a holding device and a sealing element, but the sealing element itself forms the holding device.
  • the semipermeable membrane is ultimately arranged on the sealing element itself, wherein it can be constructed in different ways, in particular it can be glued, embedded, welded or pressed.
  • the sealing element has a sealing seat for insertion into an opening of the housing.
  • the sealing seat can be present in any meaningful embodiment which ensures the corresponding sealing function and introduction into the housing, for example by means of positive locking or frictional connection, ie that the sealing element engages around the housing bore into which it is introduced from the front and rear sides or in the housing bore inserted, which is usually required a slight excess of the sealing element relative to the housing opening.
  • an introduction by means of gluing is possible, the fixation and the formation of the sealing seat being effected with the aid of an adhesive film, that is to say a substance which brings about adhesion.
  • the sealing element consists of elastic material.
  • the sealing element consists of elastic material.
  • the housing opening comprehensive retention of the sealing element within the housing opening, as well as during pressing with traction, the force exerted by the elastic material on the housing wall forces are decisive.
  • the embodiment made of elastic material facilitates the introduction into the housing opening, since the sealing element can be deformed.
  • the elastic material is an elastomer.
  • the sealing element is designed as a plug.
  • plug is meant essentially any plug-shaped design, it is not mandatory that the plug has a round cross section, but the round cross-section is advantageous.
  • the sealing element has an annular groove or waist, which forms the sealing seat.
  • the annular groove or waist will be chosen so that it is introduced with tension in the housing opening.
  • the sealing element as a plug or of elastic material, in particular as a plug made of elastic material, in this way an excellent seal front and back of the housing through the median groove or on the housing wall when using a waist (traction) causes.
  • the semipermeable membrane is covered by a protective element which is attached directly or indirectly to the sealing element.
  • the protective element may be cup-shaped and substantially inverted over the sealing element.
  • the attachment of the protective element can be direct or indirect, so for example by clamping action of the sealing element within the protective element, for example, the sealing element holds the cup-shaped protective element by way of adhesion, or indirectly by using fasteners, such as points, noses or the like, the engage in the sealing element starting from the protective element, or by Screw connection or bonding. Decisive is solely that the protective element is sufficiently secure attached to the sealing element.
  • a gap is formed between the semipermeable membrane and the protective element.
  • the space acts as a chamber, which causes the pressure transfer between the environment and the housing interior. It allows the membrane to move out of its rest position to a small extent.
  • the intermediate space is communicatively connected to the environment. This can be done for example by openings, which are preferably mounted laterally on the protective element (ie not in the immediate opposite of the membrane), as well as openings or spacers to the periphery of the sealing element, which allow communicating with the opening side of the protective element.
  • FIG. 1 shows a pressure compensation element 1 with a sealing element 2 for sealing against a housing wall 3, wherein the sealing element 2 has a continuous recess 4, ie substantially as a stopper 5 a core hole 6 is configured.
  • the sealing element 2 has on an underside 7 a flank taper 8, which serves to facilitate insertion into an opening 9 of the housing wall 3.
  • the annular groove is designed to be approximately narrower in axial dimension than the thickness d of the housing wall requires this, and in their region of the plug diameter is slightly larger than that required by the opening 9 of the housing wall 3, so therefore a light Excessive. In this way, clamping fit is achieved within the opening 9.
  • the sealing element 2 is at the same time holding device 13 for the semipermeable membrane 12.
  • the semipermeable membrane 12 covers in each case the recess 4 of the sealing element 2.
  • the top 11 of the sealing element 2 and the semipermeable membrane 12 are covered by a protective element 14, which is designed in the manner of a pot 15.
  • the pot 15 has a pot bottom 16 and a pot side wall 17, wherein the pot side wall 17 is in contact position with a plug outer wall 18 of the sealing element 2, preferably a clamping fit thereto.
  • the pot 15 completely overlaps the semipermeable membrane 12 arranged on the upper side 11 of the sealing element 2, the pot bottom 16 being prevented from directly resting on the semipermeable membrane by spacers 19, so that a gap 20 is formed between the semipermeable membrane 12 and the pot bottom 16 ,
  • the pot side wall 17 has, not shown here, recesses over which the intermediate space 20 communicates with an environment U of the pressure compensation element 1. Consequently, in the intermediate space 20, the same air pressure prevails as in the environment U.
  • the sealing element 2 For attaching the pressure compensation element 1 in a sealed housing, not shown here, for the fragmentary housing wall 3 is reproduced, and having a housing interior I is the sealing element 2, either initially only with the semipermeable membrane 12 or already both with the semipermeable Membrane 12 is provided on its upper side 11 and pre-assembled with the protective element 14, introduced by means of the edge taper 8 on its underside 7 in the opening 9 of the housing wall 3.
  • the sealing element 2 consists of an elastic material 21, namely an elastomer 22. The sealing element 2 deforms when introduced into the opening 9, consequently, at least with its located between the bottom 7 and ring groove 10 section.
  • the protective element 14 lies above the semipermeable membrane 12 such that mechanical damage to the semipermeable membrane 12 due to external influences is not possible.
  • the pressure transfer between the environment U and the gap 20 takes place through the (not shown here) recesses of the pot side wall 17, so that mechanical influences on the one hand can not directly touch the semi-permeable membranes 12, and on the other hand eventual application of water to the semipermeable membrane 12, in particular in the intermediate space 20th , can easily run through the not shown recesses through the pot side wall.
  • FIG. 2 shows a detail of another way of fixing the protective element 14 on a sealing element 2, in turn, the semipermeable membrane 12 carries on its upper side 11, and wherein the bottom of the pot 16 via spacers 19 to form a gap 20 is arranged.
  • the pot side wall 17 has for this purpose a Topfinnenwandung 24, which, starting from a membrane-side end 25 of the pot inner wall toward a cup bottom 16 opposite pot end 26 reinforced inside, thus therefore the inner diameter of the pot 15, starting from the membrane-side end 25 near the pot bottom 16th ever narrower, the pot side wall 17 is getting stronger.
  • the sealing element 2 points in Corresponding to this, a geometry which, starting from a contact surface 27 of the semipermeable membrane 12, is progressively narrowed so that the sealing element 2 continues to decrease in diameter the further it moves away from the semipermeable membrane 12, up to the region where where the pot end 26 is reached. As a result, an undercut 28 is formed, which causes a clamping seat 29 of the pot 15 on the sealing element 2.
  • the protective element 14 easily be securely mounted on the sealing element 2, where it sits securely clamped by the undercut 28.
  • the protective element 14 still provides in the pot side wall 17, of course, the same recesses for pressure communication between the environment U and the gap 20 ready, as already described above.

Abstract

The balance unit (1) has a semi-permeable membrane (12) held by a holding device and a sealing unit (2) for sealing against a housing. The holding device is formed by the sealing unit. The sealing unit exhibits a sealing seat (23) for insertion into an opening (9) of the housing. The sealing unit consists of a flexible material (21) i.e. elastomer (22). The sealing unit is designed as a stopper, and exhibits a circular groove (10) or a waist, which forms the sealing seat. A gap (20) is formed between the membrane and a protection unit (14).

Description

Die Erfindung betrifft ein Druckausgleichelement für ein Gehäuse nach Oberbegriff des Anspruchs 1.The invention relates to a pressure compensation element for a housing according to the preamble of claim 1.

Stand der TechnikState of the art

Abgedichtete Gehäuse sind im Stand der Technik geläufig. Insbesondere werden sie in Anwendungen für elektronische Steuerungen in Fahrzeugen, beispielsweise für Steuergeräte, eingesetzt. Um den sehr weiten thermischen und barometrischen Einsatzbereich der Anwendungen gerecht zu werden, und aufgrund des Umstandes, dass durch Erwärmung und Abkühlung der eingebrachten elektronischen Schaltungen es zu Unter- und Überdrücken im Gehäuse kommt, die die Dichtungen und Verbindungsstellen belasten, bedürfen solcher abgedichteten Gehäuse eines Druckausgleichs. Der Druckausgleich wird im Stand der Technik durch semipermeable Membranen gewährleistet, die im Regelfall direkt auf das Gehäuse geklebt, geschweißt oder mit Kunststoff umspritzt werden. Um die semipermeablen Membranen in Verbindung mit einem solchen Gehäuse zu verwenden, bedürfen diese grundsätzlich eines mechanischen Schutzes, um eine Beschädigung und damit Undichtheit vermieden zu können. Aufgrund der unterschiedlichen Einbausituationen und Einbauanforderungen in den unterschiedlichen Applikationen ist der mechanische Schutz jeweils konstruktiv auf die jeweilige Einbausituation anzupassen, was erheblichen Aufwand verursacht. Weiter werden häufig zusätzliche Dichtelemente benötigt, beispielsweise O-Ringe, um die Dichtheit von als Zulieferteilen verwendete Membrane oder Schutzvorrichtungen zu gewährleisten.Sealed housings are well known in the art. In particular, they are used in applications for electronic controls in vehicles, for example, for control devices. In order to meet the very wide thermal and barometric application of the applications, and due to the fact that due to heating and cooling of the introduced electronic circuits there are under- and overpressures in the housing, which burden the seals and joints, require such sealed housing a pressure equalization. The pressure equalization is ensured in the prior art by semipermeable membranes, which are usually glued directly to the housing, welded or molded with plastic. In order to use the semi-permeable membranes in conjunction with such a housing, they generally require mechanical protection in order to avoid damage and thus leakage. Due to the different installation situations and installation requirements in the different applications, the mechanical protection has to be adapted constructively to the respective installation situation, which causes considerable expense. Furthermore, additional sealing elements are frequently required, for example O-rings, in order to ensure the tightness of membranes or protective devices used as vendor parts.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es, ein Druckausgleichelement für ein abgedichtetes Gehäuse bereitzustellen, das die genannten Nachteile vermeidet, und im Bereich hoher mechanischer und fluidischer Belastung einen sicheren Druckausgleich bei gleichzeitiger Dichtheit gewährleistet.The object of the invention is to provide a pressure compensation element for a sealed housing, which avoids the disadvantages mentioned, and ensures safe pressure equalization with simultaneous tightness in the area of high mechanical and fluidic load.

Hierzu wird ein Druckausgleichelement für ein Gehäuse, insbesondere für ein Gehäuse, das eine elektronische Schaltung aufnimmt, vorgeschlagen, mit einer von einer Haltevorrichtung gehaltenen semipermeablen Membran und mindestens einem Dichtelement zur Abdichtung gegenüber dem Gehäuse. Es ist vorgesehen, dass die Haltevorrichtung von dem Dichtelement gebildet ist. Haltevorrichtung und Dichtelement sind folglich, zumindest im Wesentlichen, ein- und derselbe Gegenstand. Die semipermeable Membran wird demzufolge nicht mit unterschiedlichen Elementen, nämlich einer Haltevorrichtung und einem Dichtelement, verwendet, sondern das Dichtelement bildet selbst die Haltevorrichtung aus. Die semipermeable Membran ist letztlich am Dichtelement selbst angeordnet, wobei sie auf unterschiedliche Art und Weise aufgebaut werden kann, insbesondere kann sie aufgeklebt, eingelassen, aufgeschweißt oder verpresst sein.For this purpose, a pressure compensation element for a housing, in particular for a housing which accommodates an electronic circuit, is proposed, with a semipermeable membrane held by a holding device and at least one sealing element for sealing against the housing. It is envisaged that the holding device is formed by the sealing element. Holding device and sealing element are therefore, at least substantially, one and the same object. The semipermeable membrane is consequently not used with different elements, namely a holding device and a sealing element, but the sealing element itself forms the holding device. The semipermeable membrane is ultimately arranged on the sealing element itself, wherein it can be constructed in different ways, in particular it can be glued, embedded, welded or pressed.

In einer weiteren Ausführungsform ist vorgesehen, dass das Dichtelement einen Dichtsitz zum Einbringen in eine Öffnung des Gehäuses aufweist. Der Dichtsitz kann hierbei in jeder sinnvollen Ausführungsform, die die entsprechende Abdichtfunktion und Einbringung in das Gehäuse gewährleistet, vorliegen, beispielsweise im Wege des Formschlusses oder des Kraftschlusses, dass also das Dichtelement die Gehäusebohrung, in die es eingebracht wird, von Vorder- und Rückseite umgreift beziehungsweise in der Gehäusebohrung steckt, wozu im Regelfall ein leichtes Übermaß des Dichtelements gegenüber der Gehäuseöffnung erforderlich sein wird. Weiter ist ein Einbringen im Wege des Einklebens möglich, wobei die Fixierung und die Ausbildung des Dichtsitzes unter Zuhilfenahme eines Klebefilms, also einer die Klebung vermittelnden Substanz, bewirkt wird.In a further embodiment it is provided that the sealing element has a sealing seat for insertion into an opening of the housing. In this case, the sealing seat can be present in any meaningful embodiment which ensures the corresponding sealing function and introduction into the housing, for example by means of positive locking or frictional connection, ie that the sealing element engages around the housing bore into which it is introduced from the front and rear sides or in the housing bore inserted, which is usually required a slight excess of the sealing element relative to the housing opening. Furthermore, an introduction by means of gluing is possible, the fixation and the formation of the sealing seat being effected with the aid of an adhesive film, that is to say a substance which brings about adhesion.

In einer weiteren bevorzugten Ausführungsform besteht das Dichtelement aus elastischem Material. Gerade beim Einbringen in eine Öffnung des Gehäuses im Wege des Formschlusses, also insbesondere durch ein auch ein Hintergreifen der Gehäuseöffnung umfassendes Halten des Dichtelements innerhalb der Gehäuseöffnung, als auch beim Einpressen mit Kraftschluss, sind die von dem elastischen Material auf die Gehäusewandung ausgeübten Kräfte maßgeblich. Ferner erleichtert die Ausführung aus elastischem Material das Einbringen in die Gehäuseöffnung, da das Dichtelement verformt werden kann.In a further preferred embodiment, the sealing element consists of elastic material. Especially when introducing into an opening of the housing by way of positive engagement, ie in particular by a rear engagement The housing opening comprehensive retention of the sealing element within the housing opening, as well as during pressing with traction, the force exerted by the elastic material on the housing wall forces are decisive. Furthermore, the embodiment made of elastic material facilitates the introduction into the housing opening, since the sealing element can be deformed.

In einer besonders bevorzugten Ausführungsform ist das elastische Material ein Elastomer.In a particularly preferred embodiment, the elastic material is an elastomer.

In einer weiteren bevorzugten Ausführungsform ist das Dichtelement als Stopfen ausgebildet. Mit Stopfen ist im Wesentlichen jede stopfenförmige Ausführung gemeint, es ist hierbei nicht zwingend erforderlich, dass der Stopfen einen runden Querschnitt aufweist, wobei der runde Querschnitt aber vorteilhaft ist.In a further preferred embodiment, the sealing element is designed as a plug. By plug is meant essentially any plug-shaped design, it is not mandatory that the plug has a round cross section, but the round cross-section is advantageous.

In einer weiteren bevorzugte Ausführungsform ist vorgesehen, dass das Dichtelement eine Ringnut oder Taille aufweist, die den Dichtsitz bildet. Die Ringnut beziehungsweise Taille wird so zu wählen sein, dass sie mit Spannung in die Gehäuseöffnung eingebracht wird. Gerade bei der Ausbildung des Dichtelements als Stopfen beziehungsweise aus elastischem Material, insbesondere als Stopfen aus elastischem Material, wird auf diese Weise eine hervorragende Abdichtung vorder- und rückseitig des Gehäuses durch Vermittlung der Eigennut beziehungsweise an der Gehäusewandung bei Verwendung einer Taille (Kraftschluss) bewirkt.In a further preferred embodiment, it is provided that the sealing element has an annular groove or waist, which forms the sealing seat. The annular groove or waist will be chosen so that it is introduced with tension in the housing opening. Especially in the formation of the sealing element as a plug or of elastic material, in particular as a plug made of elastic material, in this way an excellent seal front and back of the housing through the median groove or on the housing wall when using a waist (traction) causes.

In einer besonders bevorzugten Ausführungsform ist vorgesehen, dass die semipermeable Membran von einem Schutzelement, das an dem Dichtelement direkt oder indirekt befestigt ist, überfangen ist. Beispielsweise kann das Schutzelement topfförmig ausgebildet und im Wesentlichen über das Dichtelement gestülpt sein. Die Befestigung des Schutzelements kann direkt oder indirekt erfolgen, also beispielsweise durch Klemmwirkung des Dichtelements innerhalb des Schutzelements, wobei beispielsweise das Dichtelement das topfförmig ausgebildete Schutzelement im Wege des Kraftschlusses hält, oder aber indirekt durch Verwendung von Befestigungsmitteln, beispielsweise Spitzen, Nasen oder ähnliches, die in das Dichtelement vom Schutzelement ausgehend eingreifen, oder durch Verschraubung oder Verklebung. Maßgeblich ist allein, dass das Schutzelement ausreichend sicher an dem Dichtelement befestigt ist.In a particularly preferred embodiment it is provided that the semipermeable membrane is covered by a protective element which is attached directly or indirectly to the sealing element. For example, the protective element may be cup-shaped and substantially inverted over the sealing element. The attachment of the protective element can be direct or indirect, so for example by clamping action of the sealing element within the protective element, for example, the sealing element holds the cup-shaped protective element by way of adhesion, or indirectly by using fasteners, such as points, noses or the like, the engage in the sealing element starting from the protective element, or by Screw connection or bonding. Decisive is solely that the protective element is sufficiently secure attached to the sealing element.

In einer weiteren Ausführungsform ist zwischen der semipermeablen Membran und dem Schutzelement ein Zwischenraum ausgebildet. Der Zwischenraum wirkt als Kammer, die die Druckvermittlung zwischen der Umgebung und dem Gehäuseinnenraum bewirkt. Er erlaubt der Membran, sich im geringen Umfang aus ihrer Ruhelage herauszubewegen.In a further embodiment, a gap is formed between the semipermeable membrane and the protective element. The space acts as a chamber, which causes the pressure transfer between the environment and the housing interior. It allows the membrane to move out of its rest position to a small extent.

In einer bevorzugten Ausführungsform ist vorgesehen, dass der Zwischenraum mit der Umgebung kommunizierend verbunden ist. Dies kann beispielsweise durch Öffnungen, die vorzugsweise seitlich an dem Schutzelement angebracht sind (also nicht in unmittelbarer Gegenüberlage der Membran), erfolgen, sowie durch Öffnungen oder Abstandshalter zum Umfang des Dichtelements, die ein Kommunizieren zur Öffnungsseite des Schutzelements hin gestatten.In a preferred embodiment it is provided that the intermediate space is communicatively connected to the environment. This can be done for example by openings, which are preferably mounted laterally on the protective element (ie not in the immediate opposite of the membrane), as well as openings or spacers to the periphery of the sealing element, which allow communicating with the opening side of the protective element.

Weitere vorteilhafte Ausführungsformen ergeben sich aus den Unteransprüchen und aus Kombinationen derselben.Further advantageous embodiments will become apparent from the dependent claims and combinations thereof.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung wird nachstehend anhand von Zeichnungen näher erläutert. Es zeigen

Figur 1
ein Druckausgleichelement aus Elastomer mit einem Schutzelement und
Figur 2
ein Schutzelement, das durch Hinterschneidung auf dem Dichtelement befestigt ist.
The invention is explained below with reference to drawings. Show it
FIG. 1
a pressure compensation element made of elastomer with a protective element and
FIG. 2
a protective element which is fastened by undercut on the sealing element.

Ausführungsform(en) der ErfindungEmbodiment (s) of the invention

Figur 1 zeigt ein Druckausgleichelement 1 mit einem Dichtelement 2 zur Abdichtung gegenüber einer Gehäusewand 3, wobei das Dichtelement 2 eine durchgehende Ausnehmung 4 aufweist, also im Wesentlichen als Stopfen 5 mit einer Kernbohrung 6 ausgestaltet ist. Das Dichtelement 2 weist an einer Unterseite 7 eine Flankenverjüngung 8 auf, die dem leichteren Einbringen in eine Öffnung 9 der Gehäusewand 3 dient. Etwa mittig bezüglich seines Axialverlaufs weist der Stopfen 5 außenumfangsseitig eine Ringnut 10 auf, deren Abmessungen so gewählt sind, dass sie einerseits der lichten Weite w der Öffnung 9 der Gehäusewand 3 wie auch der Stärke d der Gehäusewand 3 entsprechen. Hierbei ist es vorteilhaft, wenn die Ringnut in Axialabmessung etwa schmäler ausgebildet ist, als die Stärke d der Gehäusewand dies erfordert, und in ihrem Bereich der Stopfen-Durchmesser etwas größer ist, als dies die Öffnung 9 der Gehäusewand 3 erfordert, also mithin ein leichtes Übermaß aufweist. Auf diese Weise wird Klemmsitz innerhalb der Öffnung 9 erreicht. An einer Oberseite 11 trägt das Dichtelement 2 vollflächig eine semipermeable Membran 12. Das Dichtelement 2 ist insoweit gleichzeitig Haltvorrichtung 13 für die semipermeable Membran 12. Die semipermeable Membran 12 überdeckt in jedem Fall die Ausnehmung 4 des Dichtelements 2. Die Oberseite 11 des Dichtelements 2 und die semipermeable Membran 12 werden von einem Schutzelement 14, das in der Art eines Topfes 15 ausgebildet ist, überfangen. Hierbei weist der Topf 15 einen Topfboden 16 und eine Topfseitenwand 17 auf, wobei die Topfseitenwand 17 in Berührlage mit einer Stopfenaußenwand 18 des Dichtelements 2 liegt, vorzugsweise einen Klemmsitz hierzu aufweist. Der Topf 15 überfängt die auf der Oberseite 11 des Dichtelements 2 angeordnete semipermeable Membran 12 vollständig, wobei der Topfboden 16 durch Abstandhalter 19 an einem direkten Aufliegen auf der semipermeablen Membran gehindert wird, sodass zwischen semipermeabler Membran 12 und dem Topfboden 16 ein Zwischenraum 20 gebildet wird. Die Topfseitenwand 17 weist, hier nicht dargestellt, Aussparungen auf, über die der Zwischenraum 20 mit einer Umgebung U des Druckausgleichelements 1 kommuniziert. Im Zwischenraum 20 herrscht demzufolge derselbe Luftdruck wie in der Umgebung U.FIG. 1 shows a pressure compensation element 1 with a sealing element 2 for sealing against a housing wall 3, wherein the sealing element 2 has a continuous recess 4, ie substantially as a stopper 5 a core hole 6 is configured. The sealing element 2 has on an underside 7 a flank taper 8, which serves to facilitate insertion into an opening 9 of the housing wall 3. Approximately centrally with respect to its Axialverlaufs the plug 5 on the outer peripheral side an annular groove 10 whose dimensions are chosen so that they correspond on the one hand to the clear width w of the opening 9 of the housing wall 3 as well as the thickness d of the housing wall 3. It is advantageous if the annular groove is designed to be approximately narrower in axial dimension than the thickness d of the housing wall requires this, and in their region of the plug diameter is slightly larger than that required by the opening 9 of the housing wall 3, so therefore a light Excessive. In this way, clamping fit is achieved within the opening 9. The sealing element 2 is at the same time holding device 13 for the semipermeable membrane 12. The semipermeable membrane 12 covers in each case the recess 4 of the sealing element 2. The top 11 of the sealing element 2 and the semipermeable membrane 12 are covered by a protective element 14, which is designed in the manner of a pot 15. Here, the pot 15 has a pot bottom 16 and a pot side wall 17, wherein the pot side wall 17 is in contact position with a plug outer wall 18 of the sealing element 2, preferably a clamping fit thereto. The pot 15 completely overlaps the semipermeable membrane 12 arranged on the upper side 11 of the sealing element 2, the pot bottom 16 being prevented from directly resting on the semipermeable membrane by spacers 19, so that a gap 20 is formed between the semipermeable membrane 12 and the pot bottom 16 , The pot side wall 17 has, not shown here, recesses over which the intermediate space 20 communicates with an environment U of the pressure compensation element 1. Consequently, in the intermediate space 20, the same air pressure prevails as in the environment U.

Zur Anbringung des Druckausgleichelements 1 in einem hier nicht dargestellten, abgedichteten Gehäuse, für das ausschnittsweise die Gehäusewand 3 wiedergegeben ist, und das einen Gehäuseinnenraum I aufweist wird das Dichtelement 2, das entweder zunächst nur mit der semipermeablen Membran 12 oder aber bereits sowohl mit der semipermeablen Membran 12 auf seiner Oberseite 11 als auch mit dem Schutzelement 14 vormontiert versehen ist, mittels der Flankenverjüngung 8 an seiner Unterseite 7 in die Öffnung 9 der Gehäusewand 3 eingebracht. Das Dichtelement 2 besteht aus einem elastischen Material 21, nämlich einem Elastomer 22. Das Dichtelement 2 verformt sich beim Einbringen in die Öffnung 9 demzufolge zumindest mit seinem zwischen Unterseite 7 und Ringnut 10 gelegenen Abschnitt. Insbesondere werden hierbei die Flankenverjüngungen 8 und der unterseitige Teil der Ringnut 10 zurückgedrängt, so dass das Dichtelement 2 bis zur Ringnut 10 in die Öffnung 9 der Gehäusewand 3 eingleitet. Nach dem Durchdringen der Öffnung 9 mit der Unterseite 7 des Dichtelements 2 kehrt dieser Abschnitt in die Ausgangslage zurück und bildet mit der Ringnut 10 einen Dichtsitz 23 aus, der das Dichtelement 2 innerhalb der Öffnung 9 der Gehäusewand 3 festhält und abdichtet. Der Gehäuseinnenraum I des abgedichteten Gehäuses wird demzufolge aufgrund der semipermeablen Membran 12 zur Umgebung U hin verschlossen; durch die Dichtheit des Dichtelements 2 ist ein Ausgleich zur Umgebung U über die Öffnung 9 der Gehäusewand 3 nicht mehr möglich. Das Schutzelement 14 liegt derart über der semipermeablen Membran 12, dass eine mechanische Beschädigung der semipermeablen Membran 12 durch äußere Einwirkungen nicht möglich ist. Die Druckvermittlung zwischen Umgebung U und dem Zwischenraum 20 erfolgt durch die (hier nicht dargestellten) Aussparungen der Topfseitenwand 17, so dass mechanische Einflüsse einerseits die semipermeablen Membranen 12 nicht direkt berühren können, und andererseits eventuelle Wasserbeaufschlagung auf der semipermeablen Membran 12, insbesondere im Zwischenraum 20, ohne Weiteres durch die nicht dargestellten Aussparungen durch die Topfseitenwand ablaufen können.For attaching the pressure compensation element 1 in a sealed housing, not shown here, for the fragmentary housing wall 3 is reproduced, and having a housing interior I is the sealing element 2, either initially only with the semipermeable membrane 12 or already both with the semipermeable Membrane 12 is provided on its upper side 11 and pre-assembled with the protective element 14, introduced by means of the edge taper 8 on its underside 7 in the opening 9 of the housing wall 3. The sealing element 2 consists of an elastic material 21, namely an elastomer 22. The sealing element 2 deforms when introduced into the opening 9, consequently, at least with its located between the bottom 7 and ring groove 10 section. In particular, in this case the flank tapers 8 and the lower-side part of the annular groove 10 are pushed back, so that the sealing element 2 to the annular groove 10 in the opening 9 of the housing wall 3 initiates. After penetrating the opening 9 with the bottom 7 of the sealing element 2, this section returns to the starting position and forms with the annular groove 10 a sealing seat 23, which holds the sealing element 2 within the opening 9 of the housing wall 3 and seals. The housing interior I of the sealed housing is therefore closed due to the semi-permeable membrane 12 to the environment U out; by the tightness of the sealing element 2 is a compensation to the environment U via the opening 9 of the housing wall 3 is no longer possible. The protective element 14 lies above the semipermeable membrane 12 such that mechanical damage to the semipermeable membrane 12 due to external influences is not possible. The pressure transfer between the environment U and the gap 20 takes place through the (not shown here) recesses of the pot side wall 17, so that mechanical influences on the one hand can not directly touch the semi-permeable membranes 12, and on the other hand eventual application of water to the semipermeable membrane 12, in particular in the intermediate space 20th , can easily run through the not shown recesses through the pot side wall.

Figur 2 zeigt ausschnittsweise eine weitere Möglichkeit der Fixierung des Schutzelements 14 auf einem Dichtelement 2, das an seiner Oberseite 11 wiederum die semipermeable Membran 12 trägt, und wobei der Topfboden 16 über Abstandshalter 19 unter Ausbildung eines Zwischenraums 20 angeordnet ist. Die Topfseitenwand 17 weist hierzu eine Topfinnenwandung 24 auf, die sich, ausgehend von einem membranseitigen Ende 25 der Topfinnenwandung hin zu einem dem Topfboden 16 gegenüberliegenden Topfende 26 innenseitig verstärkt, mithin also der Innendruchmesser des Topfes 15, ausgehend vom membranseitigen Ende 25 nahe des Topfbodens 16 immer enger, die Topfseitenwand 17 indes immer stärker wird. Das Dichtelement 2 weist in Entsprechung hierzu eine Geometrie auf, die sich, ausgehend von einer Auflagefläche 27 der semipermeablen Membran 12 an immer weiter verjüngt, so dass das Dichtelement 2 im Durchmesser immer weiter abnimmt, je weiter es sich von der semipermeablen Membran 12 entfernt, bis zu dem Bereich, an dem das Topfende 26 erreicht ist. Hierdurch wird eine Hinterschneidung 28 gebildet, die einen Klemmsitz 29 des Topfes 15 auf dem Dichtelement 2 bewirkt. Auf diese Weise kann ohne besonderes Befestigungsvorrichtungen das Schutzelement 14 ohne Weiteres auf dem Dichtelement 2 sicher angebracht werden, wo es durch die Hinterschneidung 28 sicher festgeklemmt sitzt. Das Schutzelement 14 stellt in der Topfseitenwand 17 nach wie vor selbstverständlich die selben Aussparungen zur Druckvermittlung zwischen der Umgebung U und dem Zwischenraum 20 bereit, wie bereits vorstehend beschrieben.Figure 2 shows a detail of another way of fixing the protective element 14 on a sealing element 2, in turn, the semipermeable membrane 12 carries on its upper side 11, and wherein the bottom of the pot 16 via spacers 19 to form a gap 20 is arranged. The pot side wall 17 has for this purpose a Topfinnenwandung 24, which, starting from a membrane-side end 25 of the pot inner wall toward a cup bottom 16 opposite pot end 26 reinforced inside, thus therefore the inner diameter of the pot 15, starting from the membrane-side end 25 near the pot bottom 16th ever narrower, the pot side wall 17 is getting stronger. The sealing element 2 points in Corresponding to this, a geometry which, starting from a contact surface 27 of the semipermeable membrane 12, is progressively narrowed so that the sealing element 2 continues to decrease in diameter the further it moves away from the semipermeable membrane 12, up to the region where where the pot end 26 is reached. As a result, an undercut 28 is formed, which causes a clamping seat 29 of the pot 15 on the sealing element 2. In this way, without special fastening devices, the protective element 14 easily be securely mounted on the sealing element 2, where it sits securely clamped by the undercut 28. The protective element 14 still provides in the pot side wall 17, of course, the same recesses for pressure communication between the environment U and the gap 20 ready, as already described above.

Claims (9)

Druckausgleichelement für ein Gehäuse, insbesondere für ein Gehäuse, das eine elektrische Schaltung aufnimmt, mit einer von einer Haltevorrichtung gehaltenen semipermeablen Membran und mindestens einem Dichtelement zur Abdichtung gegenüber dem Gehäuse, dadurch gekennzeichnet, dass die Haltevorrichtung (13) von dem Dichtelement (2) gebildet ist.Pressure compensation element for a housing, in particular for a housing which accommodates an electrical circuit, with a semipermeable membrane held by a holding device and at least one sealing element for sealing against the housing, characterized in that the holding device (13) of the sealing element (2) is. Druckausgleichelement nach Anspruch 1, dadurch gekennzeichnet, dass das Dichtelement (2) einen Dichtsitz (23) zum Einbringen in eine Öffnung (9) des Gehäuses aufweist.Pressure compensation element according to claim 1, characterized in that the sealing element (2) has a sealing seat (23) for introduction into an opening (9) of the housing. Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Dichtelement (2) aus elastischem Material (21) besteht.Pressure compensation element according to one of the preceding claims, characterized in that the sealing element (2) consists of elastic material (21). Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das elastische Material (21) ein Elastomer (22) ist.Pressure compensation element according to one of the preceding claims, characterized in that the elastic material (21) is an elastomer (22). Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Dichtelement (2) als Stopfen (5) ausgebildet ist.Pressure compensation element according to one of the preceding claims, characterized in that the sealing element (2) is designed as a plug (5). Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Dichtelement (2) eine Ringnut (10) oder Taille aufweist, die den Dichtsitz (23) bildet.Pressure compensation element according to one of the preceding claims, characterized in that the sealing element (2) has an annular groove (10) or waist, which forms the sealing seat (23). Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die semipermeable Membran (12) von einem Schutzelement (14), das am Dichtelement (2) direkt oder indirekt befestigt ist, überfangen ist.Pressure compensation element according to one of the preceding claims, characterized in that the semipermeable membrane (12) of a protective element (14) which is attached directly or indirectly to the sealing element (2), is covered. Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen semipermeabler Membran (12) und dem Schutzelement (14) ein Zwischenraum (20) ausgebildet ist.Pressure compensation element according to one of the preceding claims, characterized in that an intermediate space (20) is formed between the semipermeable membrane (12) and the protective element (14). Druckausgleichelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Zwischenraum (20) mit der Umgebung (U) kommunizierend verbunden ist.Pressure compensation element according to one of the preceding claims, characterized in that the intermediate space (20) is communicatively connected to the environment (U).
EP07117632A 2006-11-10 2007-10-01 Pressure compensation element for a casing Withdrawn EP1921020A1 (en)

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WO2009135716A2 (en) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Housing for a drive device, drive device and method for testing the tightness of a pressure compensating membrane
CN103493240A (en) * 2011-03-22 2014-01-01 罗伯特·博世有限公司 Pressure equalization element, housing comprising a pressure equalization element, lithium ion accumulator and motor vehicle
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EP2908409A1 (en) * 2014-02-12 2015-08-19 Pierburg Pump Technology GmbH Motor vehicle auxiliary electric motor
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KR101831817B1 (en) 2015-03-20 2018-02-23 주식회사 엘지화학 Battery pack for a vehicle having gas discharge means and pressure compensating means
WO2019072825A1 (en) * 2017-10-10 2019-04-18 Brose Fahrzeugteile Gmbh & Co Kommanditgesellscahft, Würzburg Electric motor and cooling fan module
WO2019213956A1 (en) * 2018-05-11 2019-11-14 华为技术有限公司 Housing assembly and terminal
US20200411914A1 (en) * 2018-07-04 2020-12-31 Bayerische Motoren Werke Aktiengesellschaft Battery Management System for a High-Voltage Battery of a Motor Vehicle, High-Voltage Battery, and Motor Vehicle

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WO2008077667A3 (en) * 2006-12-22 2009-04-16 Bosch Gmbh Robert Pressure compensation element for a housing and electrical automotive component comprising said pressure compensation element
WO2009135716A2 (en) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Housing for a drive device, drive device and method for testing the tightness of a pressure compensating membrane
WO2009135716A3 (en) * 2008-05-06 2009-12-30 Robert Bosch Gmbh Housing for a drive device, drive device and method for testing the tightness of a pressure compensating membrane
US8356520B2 (en) 2008-05-06 2013-01-22 Robert Bosch Gmbh Housing for a drive device, drive device and method for testing the tightness of a pressure compensating membrane
CN103493240B (en) * 2011-03-22 2016-11-02 罗伯特·博世有限公司 Pressure compensation element, there is the shell of pressure compensation element, lithium-ions battery and motor vehicles
CN103493240A (en) * 2011-03-22 2014-01-01 罗伯特·博世有限公司 Pressure equalization element, housing comprising a pressure equalization element, lithium ion accumulator and motor vehicle
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EP2908409A1 (en) * 2014-02-12 2015-08-19 Pierburg Pump Technology GmbH Motor vehicle auxiliary electric motor
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WO2016096421A3 (en) * 2014-12-19 2016-08-11 Robert Bosch Gmbh Protective device for a pressure equalizing element
KR101831817B1 (en) 2015-03-20 2018-02-23 주식회사 엘지화학 Battery pack for a vehicle having gas discharge means and pressure compensating means
WO2019072825A1 (en) * 2017-10-10 2019-04-18 Brose Fahrzeugteile Gmbh & Co Kommanditgesellscahft, Würzburg Electric motor and cooling fan module
WO2019213956A1 (en) * 2018-05-11 2019-11-14 华为技术有限公司 Housing assembly and terminal
US20200411914A1 (en) * 2018-07-04 2020-12-31 Bayerische Motoren Werke Aktiengesellschaft Battery Management System for a High-Voltage Battery of a Motor Vehicle, High-Voltage Battery, and Motor Vehicle

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